The KURO KAGE Black with Dual-Core TiNi Technology and Straight Flight Weighting (SFW) is MCA GOLFs latest design that yields the same high launch and profile as its predecessor KURO KAGE Black TiNi ? but now features Dual-Core Titanium Nickel (TiNi) Wire and SFW. Available in 40 gram and 50 gram models, SFW helps golfers square the clubface through impact, thus creating straighter shots. The lightest of the two weight options also incorporates the Straight Flight Weighting (SFW) System that helps golfers turn the club over easier through impact, which in turn straightens a slight fade or promotes a slight draw.